book Maths Puzzle Numerical Ability

a vending machine has $41.25 in it. there are 255 coins total and the machine only accepts nickels,dimes and quarters. there are twice as many dimes as nickels.how many of each coi

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Locate 10 between consecutive perfect-square integers A scientist has to make 800ml of 61% sulfuric acid solution. He has available a one liter bottle of 40% sulfuric acid solution and a one liter bottle of 75% sulfuric acid solution.